/* ----------------------------------------------------------------------
 * Project:      CMSIS DSP Library
 * Title:        arm_max_no_idx_f32.c
 * Description:  Maximum value of a floating-point vector without returning the index
 *
 * $Date:        16. October 2019
 * $Revision:    V1.6.0
 *
 * Target Processor: Cortex-M and Cortex-A cores
 * -------------------------------------------------------------------- */
/*
 * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "arm_math.h"
#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE)
#include <limits.h>
#endif

/**
  @ingroup groupStats
 */


/**
  @addtogroup Max
  @{
 */

/**
  @brief         Maximum value of a floating-point vector.
  @param[in]     pSrc       points to the input vector
  @param[in]     blockSize  number of samples in input vector
  @param[out]    pResult    maximum value returned here
  @return        none
 */

#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)

void arm_max_no_idx_f32(
	const float32_t *pSrc,
	uint32_t   blockSize,
	float32_t *pResult)
{
	f32x4_t     vecSrc;
	f32x4_t     curExtremValVec = vdupq_n_f32(F32_MIN);
	float32_t   maxValue = F32_MIN;
	float32_t   newVal;
	uint32_t    blkCnt;

	/* Loop unrolling: Compute 4 outputs at a time */
	blkCnt = blockSize >> 2U;

	while (blkCnt > 0U) {

		vecSrc = vldrwq_f32(pSrc);
		/*
		 * update per-lane max.
		 */
		curExtremValVec = vmaxnmq(vecSrc, curExtremValVec);
		/*
		 * Decrement the blockSize loop counter
		 * Advance vector source and destination pointers
		 */
		pSrc += 4;
		blkCnt --;
	}
	/*
	 * Get max value across the vector
	 */
	maxValue = vmaxnmvq(maxValue, curExtremValVec);

	blkCnt = blockSize & 3;

	while (blkCnt > 0U) {
		newVal = *pSrc++;

		/* compare for the maximum value */
		if (maxValue < newVal) {
			/* Update the maximum value and it's index */
			maxValue = newVal;
		}

		blkCnt --;
	}

	*pResult = maxValue;
}

#else

void arm_max_no_idx_f32(
	const float32_t *pSrc,
	uint32_t   blockSize,
	float32_t *pResult)
{
	float32_t   maxValue = F32_MIN;
	float32_t   newVal;

	while (blockSize > 0U) {
		newVal = *pSrc++;

		/* compare for the maximum value */
		if (maxValue < newVal) {
			/* Update the maximum value and it's index */
			maxValue = newVal;
		}

		blockSize --;
	}

	*pResult = maxValue;
}

#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */

/**
  @} end of Max group
 */
